Talk:Disulfide bond

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Cytoplasmic disulfide bonds in eukaryotes[edit]

The Hatahet et al. paper says that disulfide bonds are not stable in the cytoplasm of E. coli because it is a reducing environment. However, neither that paper nor Sevier et al. say the same about eukaryotes. Certainly the proteins are stable in the endoplasmic reticulum where they are created. There are probably other organelles where they are stable as well. If "usually proteins secreted to the extracellular medium" is true for eukaryotes, an additional source is needed to support this. 140.233.203.193 (talk) 18:17, 2 March 2012 (UTC)[reply]

Cys-cys bonds[edit]

Quoting from the text:

When two cysteine amino acids bond to each other, they do so through a disulfide bond.

Ouch. No cys-cys dipeptides? David M

Disulphide bonds in bacteria[edit]

I think that the section on disuplhide bonds in bacteria should be made clearer. I am a microbiologist and I'm really unsure to what you are refering when you say as a reversible switch that turns a protein on or off when bacterial cells are exposed to oxidation reactions.

Also bacteria do have the ability to form disulphide bonds but only in the periplasm where it is an oxidizing enviroment.

Nick

Formation rates[edit]

Is there any info on rates of formation? Or even some references. This is a complicated question, however it may be good to address it rather than ignore it. For instance: rate of thiol to thiol disulfide formation vs rate of CYS to CYS disulfide formation, etc.

Spamming Wikipedia[edit]

Biologicalworld.com has spammed wikipedia like no tomorrow. He is a site of only a few pages and a LOT of adsense. Not much information is given except for "protocols" which are not referenced, and cannot be trusted from a site of that quality.

check: Links from Wikipedia

The following have been cleaned up:

en.wikipedia.org/wiki/Plasmid
en.wikipedia.org/wiki/Gel_electrophoresis
en.wikipedia.org/wiki/Green_fluorescent_protein
en.wikipedia.org/wiki/Homology_(biology)
en.wikipedia.org/wiki/HeLa
en.wikipedia.org/wiki/Protease
en.wikipedia.org/wiki/Restriction_enzyme
en.wikipedia.org/wiki/Petri_dish
en.wikipedia.org/wiki/Structural_domain
en.wikipedia.org/wiki/Trypsin
en.wikipedia.org/wiki/Oligonucleotide
en.wikipedia.org/wiki/Transmission_electron_microscope
en.wikipedia.org/wiki/Agar_plate
en.wikipedia.org/wiki/Calcium_phosphate
en.wikipedia.org/wiki/Disulfide_bond
en.wikipedia.org/wiki/Denaturation_(biochemistry)
en.wikipedia.org/wiki/DNA_ligase
en.wikipedia.org/wiki/Wild_type
en.wikipedia.org/wiki/Tissue_culture
en.wikipedia.org/wiki/Transmission_electron_microscopy
en.wikipedia.org/wiki/Reporter_gene
en.wikipedia.org/wiki/Northern_blot
en.wikipedia.org/wiki/Protein_engineering
en.wikipedia.org/wiki/Sticky_end/blunt_end
en.wikipedia.org/wiki/Taq_polymerase
en.wikipedia.org/wiki/Protein_domain
en.wikipedia.org/wiki/Coomassie
en.wikipedia.org/wiki/Native_state
en.wikipedia.org/wiki/Chinese_Hamster_Ovary_cell
en.wikipedia.org/wiki/Peptidase
en.wikipedia.org/wiki/Visking_tubing
en.wikipedia.org/wiki/Streptavidin
en.wikipedia.org/wiki/Microtiter_plate
en.wikipedia.org/wiki/Subcloning
en.wikipedia.org/wiki/Ion_exchange_chromatography
en.wikipedia.org/wiki/Thermal_cycler
en.wikipedia.org/wiki/Bovine_serum_albumin
en.wikipedia.org/wiki/Phosphate_buffered_saline
en.wikipedia.org/wiki/Glutathione_S-transferase
en.wikipedia.org/wiki/HEPES
en.wikipedia.org/wiki/Ortholog
en.wikipedia.org/wiki/Proteases
en.wikipedia.org/wiki/Salting_out
en.wikipedia.org/wiki/Fetal_bovine_serum
en.wikipedia.org/wiki/Proteolytic_enzyme
en.wikipedia.org/wiki/DNA_end
en.wikipedia.org/wiki/Supernatant
en.wikipedia.org/wiki/ABTS
en.wikipedia.org/wiki/Conserved_sequence
en.wikipedia.org/wiki/Peptide_mass_fingerprinting
en.wikipedia.org/wiki/Dithiothreitol
en.wikipedia.org/wiki/Uranyl_acetate

and many more Sciencetalks (talk) —Preceding comment was added at 03:03, 4 January 2008 (UTC)[reply]

Corrections needed[edit]

There are quite a few mistakes in this article. I have fixed some, but many remain. For example, it can't be stated that in-vivo disulfide rearrangement reactions (or other reactions involving disulfides) are intra-molecular. Disulfide formation/destruction/isomerization is generally a catalyzed process in living cells, and catalysis usually involves formation of inter-molecular mixed disulfide bond with the catalyst. I hope to find some time to add a section on how disulfide bonds are formed and destroyed in different compartments of prokaryotic and eukaryotic cells. The importance of disulfide bonds in living organisms is understated. For example, the production of deoxyribonucleotides (building blocks of the genetic code) involves an enzyme called ribonucleotide reductase, with a disulfide bond at it's catalytic heart. The numbering of the figures should be removed, as now some figures are numbered while others are not. Thioredoxins usually do not have vicinal Cys. The catalytic motif in Trx is CXXC. It usually participates in the reduction of disulfide bonds in cytoplasm with an indirect role of oxidation of extracytoplasmic proteins through an electron relay such as DsbD in E. coli. Naming cytoplasm (redox potential ~-300 mV) as reducing environment and e.g. endoplasmic reticulum (-160 mV) as oxidizing is misleading, i.e. standard redox potential of oxygen (O2) is +620 mV.

Fermmyt (talk) 23:35, 4 October 2013 (UTC)[reply]